US20190242462A1 - System and Method to Align Belt Integrated Starter Generator Tensioners - Google Patents
System and Method to Align Belt Integrated Starter Generator Tensioners Download PDFInfo
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- US20190242462A1 US20190242462A1 US15/890,572 US201815890572A US2019242462A1 US 20190242462 A1 US20190242462 A1 US 20190242462A1 US 201815890572 A US201815890572 A US 201815890572A US 2019242462 A1 US2019242462 A1 US 2019242462A1
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- bisg
- pulley
- tensioner
- rem
- belt
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
- F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2717/00—Arrangements for indicating or measuring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0842—Mounting or support of tensioner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0861—Means for varying tension of belts, ropes, or chains comprising means for sensing tensioner position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0865—Pulleys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0874—Two or more finally actuated members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0893—Circular path
Definitions
- the present disclosure relates to systems and methods to align a belt integrated starter generator (BISG) tensioner.
- BISG belt integrated starter generator
- Automotive vehicles commonly employ an alternator, which is driven from the crankshaft to produce electrical energy for storage in the battery to power onboard accessories such as the electronic control module, power windows, fans, etc., and a starter motor that engages with a ring gear on the flywheel to rotate the engine for starting.
- alternator which is driven from the crankshaft to produce electrical energy for storage in the battery to power onboard accessories
- starter motor that engages with a ring gear on the flywheel to rotate the engine for starting.
- ISG integrated starter-generator
- ISGs can be coupled to the engine via a gear.
- the ISG can be a belt driven ISG (BISG).
- BISG belt driven ISG
- tensioners are provided against the entry span and exit span of the belt. Mounting the tensioners close to the BISG results in short belt spans between the tensioner pulley and the BISG pulley, i.e., more compactness.
- the inevitable stack up tolerances when taken over a short span length between the pulley of the BISG and the tensioner, lead to a large belt misalignment angle and/or offset.
- Such a condition results in belt wear and ultimately belt noise.
- the particular frequency of a whining or chirping belt is particularly annoying to vehicle occupants and can lead to significant customer dissatisfaction.
- a way to improve the alignment of the belt tensioner pulleys with respect to the BISG pulley is desired.
- an alignment method includes: mounting a tensioner having at least one tensioner arm onto a belt integrated-starter generator (BISG), measuring offset of a pulley of the BISG, and machining bearing seats on the tensioner arms based on the measured offset of the BISG pulley.
- BISG belt integrated-starter generator
- the measured offset is determined relative to datums on the BISG.
- the datums on the BISG are attachment features.
- the measured offset comprises at least one of axial misalignment and angular misalignment.
- the BISG is mounted into a fixture prior to measuring the offset.
- Measuring offset of the BISG pulley may further include: placing at least three spaced-apart probes against a circumferential surface of the BISG pulley adapted for a belt to ride against, rotating the BISG pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the BISG pulley, and determining a best-fit plane of the BISG pulley.
- the circumferential surface of the BISG pulley has a plurality of circumferential grooves. Ends of the probes are hemispherical. The ends of the probes ride in one of the circumferential grooves during the rotation of the BISG pulley for collecting probe data.
- the bearing seats of the tensioner arms are machined to match the best-fit plane of the BISG pulley.
- the tensioner arms are rotated into a nominal operating position prior to machining the bearing seats.
- the two tensioner arms are integrated into a twin-arm tensioner.
- an alignment method that includes: mounting a tensioner on a rotating electrical module (REM), the tensioner having at least one tensioner arm with a bearing seat, mounting the REM onto a measuring fixture, measuring axial and angular offset of a pulley of the REM and machining the bearing seat of the tensioner arm based on the measured offsets of the pulley of the REM.
- REM rotating electrical module
- the measured offsets are determined relative to a plurality of datums on the REM.
- the datums on the REM are proximate attachment features of the REM. At least one of the attachment features is a bolt hole.
- One or more of the datums, in some embodiments, is a boss with a bolt hole therein.
- the method may also include: placing at least three spaced-apart probes against a circumferential surface of the REM pulley adapted for a belt to ride against, rotating the REM pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the REM pulley, and determining a best-fit plane of the REM pulley.
- Measuring offset of the REM pulley includes: placing at least three spaced-apart probes against a circumferential surface of the REM pulley adapted for a belt to ride against, rotating the REM pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the REM pulley, and determining a best-fit plane of the REM pulley.
- the circumferential surface of the REM pulley has a plurality of circumferential grooves. Ends of the probes are hemispherical. Ends of the probes ride in one of the circumferential grooves during the rotating of the REM pulley for collecting probe data.
- the REM is a BISG, in some embodiments.
- the at least one tensioner arm comprises an entry tensioner arm and an exit tensioner arm.
- the bearing seats of the entry and exit tensioner arms are machined to match the best-fit plane of the BISG pulley.
- the tensioner arms are spring loaded to provide tension on the belt during operation.
- the tensioner arms are rotated into a nominal position prior to machining the bearing seats.
- BISG belt integrated-starter generator
- the datums are attachment points of the BISG, such as a boss proximate a bolt hole.
- the method can include: fixturing the BISG prior to measuring the offsets and orienting the BISG; the fixture so that machining chips from the bearing seats fall away from the BISG; placing at least three spaced-apart probes against a circumferential surface of the BISG pulley adapted for a belt to ride against; rotating the BISG pulley; collecting probe data as a function of rotational angle; computing the axial misalignment and angular offsets of the BISG pulley based on the probe data; and determining the best-fit plane of the BISG pulley based on the axial and angular misalignments.
- the two tensioner arms are integrated into a two-arm component.
- the tensioner includes a spring that acts on the tensioner arms.
- FIG. 1 is an illustration of a front end of an internal-combustion engine to which a BISG is coupled;
- FIG. 2 is a portion of FIG. 1 showing the ends of travel of the tensioner pulleys
- FIG. 3 is an isometric view of a BISG and a tensioner which couples to the BISG;
- FIG. 4 shows the BISG of FIG. 3 assembled to the tensioner with measuring sensors arranged on the BISG pulley;
- FIG. 5 shows a twin-arm tensioner
- FIG. 6 is the tensioner of FIG. 5 partially in cutaway to show the bearing seats on which the tensioner pulleys ride;
- FIG. 7 is a flowchart of steps involved in aligning the BISG and tensioner.
- a front view of an engine 10 shows a front-end accessory drive.
- An end of a crankshaft 10 has a crankshaft pulley 12 coupled thereto.
- the accessories that are driven by or driving crankshaft 12 are a water pump, and a belt integrated starter generator (BISG) 40 .
- a serpentine belt 22 couples the pulleys in the system: a water pump pulley 16 , idler pulleys 18 and 20 , crankshaft pulley 14 , and a BISG pulley 42 .
- a tensioner 50 is coupled to BISG 40 .
- Tensioner 50 has two pulleys 52 and 54 .
- a spring-loaded pulley is provided on both the entry side (i.e., the side where the belt is traveling to crankshaft pulley 14 ) and the exit side (i.e., the side where the belt is exiting BISG pulley 42 and traveling to idler pulley 18 ).
- Tensioner pulleys 52 and 54 are provided on short arms (not separately visible in FIG. 1 ), the arms rotating over a small number of angles.
- FIG. 2 the range of motion of the tensioner pulleys is illustrate with 52 showing one end of travel and 53 showing the other end of travel for pulley 52 .
- 55 shows the other end of travel for pulley 54 .
- the pulleys move, in operation, based on the applied forces on them from belt 22 and the spring that acts upon them.
- a BISG 60 is shown with a tensioner 70 prior to installation.
- BISG 60 has a pulley 62 with circumferential grooves 64 . It is at this outer circumference of pulley 62 , i.e., the surface with the grooves where the belt (not shown) rides in operation.
- datums are used for measurement.
- four datums 66 are used that are bosses of attachment feature.
- the attachment features next to datums 66 are coupled to brackets that couple to the engine.
- Bolt holes 68 are provided to couple a tensioner 70 to BISG 60 .
- Tensioner 70 has a flat spring 72 that couples to pulleys 74 and 76 . During operation the belt rides on outer surfaces 75 and 77 of pulleys 74 and 76 , respectively.
- FIG. 4 A portion of a measurement system is shown in FIG. 4 . Tips of probes 80 ride in a groove 64 of BISG pulley 62 . Three equally-spaced probes are shown in FIG. 4 . In other embodiments, more probes can be used and/or a different spacing of the probes can be used. Probes 80 are coupled to sensors 82 , which provide electrical signals to data collection device 88 . Wireless signals are shown in FIG. 4 . Alternatively, data collection device is coupled to sensors 82 via electrical wires. A static measurement of the position of probes 80 with respect to datums 66 provide some of the alignment information. However, problems with the shaft are uncovered by rotating pulley 62 and measuring the position of probes 80 as a function of rotation angle.
- Tensioner 70 has two pulleys 150 are partially disassembled as shown in FIG. 4 so that bearing seats 152 of pulleys 150 are visible and accessible for machining based on the analyzed data from sensors 82 .
- Fixturing BISG 60 involves at least engaging nubs 122 with the bolt holes associated with datums 66 .
- FIG. 5 An alternative tensioner 90 is shown in FIG. 5 that has pulleys 92 and 94 .
- a tensioner arm 96 of pulley 94 is visible in FIG. 5 .
- FIG. 6 illustrates a side view of tensioner 90 that is partially sectioned.
- a coil spring 96 provides the desired tension for both pulleys 92 and 94 .
- Pulley 4 is shown in cross section to show a bolt 98 that couples pulley 92 to a tensioner arm 102 . It is a surface of bearing seats 100 that control the alignment of pulley 92 . Bearing seats 100 are machined based on data collected on alignment.
- the tensioner pulleys are coupled to the BISG via a single tensioner arm, such as 102 .
- the tensioner arm is made up of two pieces 104 and 106 .
- a BISG is just one example rotating electrical module (REM) to which the present disclosure applies.
- a BISG typically has a tensioner with an entry and an exit pulley.
- the pulleys are coupled to a two-arm tensioner that couples directly to the BISG.
- one or both of the pulleys that apply tension are coupled to other engine components, in which case misalignment has a less magnified effect on belt twisting and offset because the pulley is often displaced from the BISG pulley by a great distance.
- the present disclosure applies to any REM, such as an alternator, and to situations with one or two spring-loaded pulleys to provide tension.
- FIG. 7 an alignment process is shown in which the tensioner is mounted to the BISG in block 200 . Then the BISG is fixtured in block 202 . It can be useful to orient the BISG pulley downwards so that when the machining commences on the bearing surfaces onto which the tensioner arm pulleys sit, the chips fall downward.
- the axial and angular offset of the BISG pulley are determined by putting three (or more) angularly-spaced probes on an outer surface of the BISG pulley. The probe ends might be hemispherical or pointed.
- the probe ends engage in one of the grooves on the outer circumference of the BISG pulley, i.e., where the belt rides during operation.
- the BISG pulley is next rotated while sensor coupled to the probes provide signals to a data acquisition unit. Data are collected as a function of angular position of the BISG pulley. From these data, a best-fit plane is computed. The offsets are computed based on datums on the BISG.
- the tensioner arms are rotated to be in the nominal operation position. In FIG. 2 , the extreme positions that the tensioner arms can attain are shown. In normal operation, there is a nominal position that the tensioner attains that is between these two extremes. Prior to machining, the tensioner arms are rotated into their nominal positions.
- the bearing seats on the tensioner arms are machined to lie in the best-fit plane that was determined in block 204 .
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- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
- The present disclosure relates to systems and methods to align a belt integrated starter generator (BISG) tensioner.
- Automotive vehicles commonly employ an alternator, which is driven from the crankshaft to produce electrical energy for storage in the battery to power onboard accessories such as the electronic control module, power windows, fans, etc., and a starter motor that engages with a ring gear on the flywheel to rotate the engine for starting. Some more recent vehicles use an integrated starter-generator (ISG), a single rotating electrical module in place of two. Additionally, an ISG facilitates mild hybridization.
- ISGs can be coupled to the engine via a gear. Alternatively, the ISG can be a belt driven ISG (BISG). To prevent belt slippage in both the driven (electrical generation) mode and the driving (engine starting) modes, tensioners are provided against the entry span and exit span of the belt. Mounting the tensioners close to the BISG results in short belt spans between the tensioner pulley and the BISG pulley, i.e., more compactness. However, the inevitable stack up tolerances, when taken over a short span length between the pulley of the BISG and the tensioner, lead to a large belt misalignment angle and/or offset. Such a condition results in belt wear and ultimately belt noise. The particular frequency of a whining or chirping belt is particularly annoying to vehicle occupants and can lead to significant customer dissatisfaction. A way to improve the alignment of the belt tensioner pulleys with respect to the BISG pulley is desired.
- To overcome the misalignment problem that leads to belt issues, an alignment method is disclosed that includes: mounting a tensioner having at least one tensioner arm onto a belt integrated-starter generator (BISG), measuring offset of a pulley of the BISG, and machining bearing seats on the tensioner arms based on the measured offset of the BISG pulley.
- The measured offset is determined relative to datums on the BISG. The datums on the BISG are attachment features. The measured offset comprises at least one of axial misalignment and angular misalignment.
- The BISG is mounted into a fixture prior to measuring the offset.
- Measuring offset of the BISG pulley may further include: placing at least three spaced-apart probes against a circumferential surface of the BISG pulley adapted for a belt to ride against, rotating the BISG pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the BISG pulley, and determining a best-fit plane of the BISG pulley.
- The circumferential surface of the BISG pulley has a plurality of circumferential grooves. Ends of the probes are hemispherical. The ends of the probes ride in one of the circumferential grooves during the rotation of the BISG pulley for collecting probe data.
- The bearing seats of the tensioner arms are machined to match the best-fit plane of the BISG pulley.
- The tensioner arms are rotated into a nominal operating position prior to machining the bearing seats.
- The two tensioner arms are integrated into a twin-arm tensioner.
- Also disclosed in an alignment method that includes: mounting a tensioner on a rotating electrical module (REM), the tensioner having at least one tensioner arm with a bearing seat, mounting the REM onto a measuring fixture, measuring axial and angular offset of a pulley of the REM and machining the bearing seat of the tensioner arm based on the measured offsets of the pulley of the REM.
- The measured offsets are determined relative to a plurality of datums on the REM. The datums on the REM are proximate attachment features of the REM. At least one of the attachment features is a bolt hole. One or more of the datums, in some embodiments, is a boss with a bolt hole therein.
- The method may also include: placing at least three spaced-apart probes against a circumferential surface of the REM pulley adapted for a belt to ride against, rotating the REM pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the REM pulley, and determining a best-fit plane of the REM pulley.
- Measuring offset of the REM pulley, in some embodiments includes: placing at least three spaced-apart probes against a circumferential surface of the REM pulley adapted for a belt to ride against, rotating the REM pulley, collecting probe data as a function of rotational angle, analyzing the data to determine axial misalignment and angular misalignment of the REM pulley, and determining a best-fit plane of the REM pulley.
- The circumferential surface of the REM pulley has a plurality of circumferential grooves. Ends of the probes are hemispherical. Ends of the probes ride in one of the circumferential grooves during the rotating of the REM pulley for collecting probe data.
- The REM is a BISG, in some embodiments. The at least one tensioner arm comprises an entry tensioner arm and an exit tensioner arm. The bearing seats of the entry and exit tensioner arms are machined to match the best-fit plane of the BISG pulley.
- The tensioner arms are spring loaded to provide tension on the belt during operation. The tensioner arms are rotated into a nominal position prior to machining the bearing seats.
- Also disclosed is a method to align bearing seats of a twin-arm tensioner coupled to a belt integrated-starter generator (BISG), including: measuring axial and angular offsets of a pulley of the BISG with respect to predetermined datums on the BISG, determining a best-fit plane of the BISG pulley based on the offsets, and machining bearing seats on the tensioner arms to match the best-fit plane of the BISG pulley.
- The datums are attachment points of the BISG, such as a boss proximate a bolt hole.
- The method can include: fixturing the BISG prior to measuring the offsets and orienting the BISG; the fixture so that machining chips from the bearing seats fall away from the BISG; placing at least three spaced-apart probes against a circumferential surface of the BISG pulley adapted for a belt to ride against; rotating the BISG pulley; collecting probe data as a function of rotational angle; computing the axial misalignment and angular offsets of the BISG pulley based on the probe data; and determining the best-fit plane of the BISG pulley based on the axial and angular misalignments.
- The two tensioner arms are integrated into a two-arm component. The tensioner includes a spring that acts on the tensioner arms.
-
FIG. 1 is an illustration of a front end of an internal-combustion engine to which a BISG is coupled; -
FIG. 2 is a portion ofFIG. 1 showing the ends of travel of the tensioner pulleys; -
FIG. 3 is an isometric view of a BISG and a tensioner which couples to the BISG; -
FIG. 4 shows the BISG ofFIG. 3 assembled to the tensioner with measuring sensors arranged on the BISG pulley; -
FIG. 5 shows a twin-arm tensioner; -
FIG. 6 is the tensioner ofFIG. 5 partially in cutaway to show the bearing seats on which the tensioner pulleys ride; and -
FIG. 7 is a flowchart of steps involved in aligning the BISG and tensioner. - As those of ordinary skill in the art will understand, various features of the embodiments illustrated and described with reference to any one of the Figures may be combined with features illustrated in one or more other Figures to produce alternative embodiments that are not explicitly illustrated or described. The combinations of features illustrated provide representative embodiments for typical applications. However, various combinations and modifications of the features consistent with the teachings of the present disclosure may be desired for particular applications or implementations. Those of ordinary skill in the art may recognize similar applications or implementations whether or not explicitly described or illustrated.
- A front view of an
engine 10, inFIG. 1 , shows a front-end accessory drive. An end of acrankshaft 10 has acrankshaft pulley 12 coupled thereto. The accessories that are driven by or drivingcrankshaft 12 are a water pump, and a belt integrated starter generator (BISG) 40. Aserpentine belt 22 couples the pulleys in the system: awater pump pulley 16,idler pulleys crankshaft pulley 14, and aBISG pulley 42. Atensioner 50 is coupled toBISG 40.Tensioner 50 has twopulleys BISG pulley 42 and traveling to idler pulley 18). - Tensioner pulleys 52 and 54 are provided on short arms (not separately visible in
FIG. 1 ), the arms rotating over a small number of angles. InFIG. 2 , the range of motion of the tensioner pulleys is illustrate with 52 showing one end of travel and 53 showing the other end of travel forpulley 52. Similarly, 55 shows the other end of travel forpulley 54. The pulleys move, in operation, based on the applied forces on them frombelt 22 and the spring that acts upon them. - In
FIG. 3 , aBISG 60 is shown with atensioner 70 prior to installation.BISG 60 has apulley 62 withcircumferential grooves 64. It is at this outer circumference ofpulley 62, i.e., the surface with the grooves where the belt (not shown) rides in operation. For alignment of the system, datums are used for measurement. OnBISG 60, fourdatums 66 are used that are bosses of attachment feature. The attachment features next to datums 66 are coupled to brackets that couple to the engine. Bolt holes 68 are provided to couple atensioner 70 toBISG 60. -
Tensioner 70 has aflat spring 72 that couples topulleys outer surfaces pulleys - A portion of a measurement system is shown in
FIG. 4 . Tips ofprobes 80 ride in agroove 64 ofBISG pulley 62. Three equally-spaced probes are shown inFIG. 4 . In other embodiments, more probes can be used and/or a different spacing of the probes can be used.Probes 80 are coupled tosensors 82, which provide electrical signals todata collection device 88. Wireless signals are shown inFIG. 4 . Alternatively, data collection device is coupled tosensors 82 via electrical wires. A static measurement of the position ofprobes 80 with respect to datums 66 provide some of the alignment information. However, problems with the shaft are uncovered by rotatingpulley 62 and measuring the position ofprobes 80 as a function of rotation angle. -
Tensioner 70 has twopulleys 150 are partially disassembled as shown inFIG. 4 so that bearingseats 152 ofpulleys 150 are visible and accessible for machining based on the analyzed data fromsensors 82. - Also shown in
FIG. 4 is afixture 120 that hasnubs 122 that engage with the bolt holesproximate datums 66 on the bosses.Fixturing BISG 60 involves at leastengaging nubs 122 with the bolt holes associated withdatums 66. - An
alternative tensioner 90 is shown inFIG. 5 that haspulleys tensioner arm 96 ofpulley 94 is visible inFIG. 5 .FIG. 6 illustrates a side view oftensioner 90 that is partially sectioned. Acoil spring 96 provides the desired tension for bothpulleys bolt 98 that couplespulley 92 to atensioner arm 102. It is a surface of bearingseats 100 that control the alignment ofpulley 92.Bearing seats 100 are machined based on data collected on alignment. In some embodiments, the tensioner pulleys are coupled to the BISG via a single tensioner arm, such as 102. Forpulley 94, the tensioner arm is made up of twopieces - A BISG is just one example rotating electrical module (REM) to which the present disclosure applies. A BISG typically has a tensioner with an entry and an exit pulley. In the embodiments shown herein, the pulleys are coupled to a two-arm tensioner that couples directly to the BISG. In alternative configurations, one or both of the pulleys that apply tension are coupled to other engine components, in which case misalignment has a less magnified effect on belt twisting and offset because the pulley is often displaced from the BISG pulley by a great distance. The present disclosure applies to any REM, such as an alternator, and to situations with one or two spring-loaded pulleys to provide tension.
- In
FIG. 7 , an alignment process is shown in which the tensioner is mounted to the BISG inblock 200. Then the BISG is fixtured inblock 202. It can be useful to orient the BISG pulley downwards so that when the machining commences on the bearing surfaces onto which the tensioner arm pulleys sit, the chips fall downward. Inblock 204, the axial and angular offset of the BISG pulley are determined by putting three (or more) angularly-spaced probes on an outer surface of the BISG pulley. The probe ends might be hemispherical or pointed. The probe ends engage in one of the grooves on the outer circumference of the BISG pulley, i.e., where the belt rides during operation. The BISG pulley is next rotated while sensor coupled to the probes provide signals to a data acquisition unit. Data are collected as a function of angular position of the BISG pulley. From these data, a best-fit plane is computed. The offsets are computed based on datums on the BISG. Inblock 206, the tensioner arms are rotated to be in the nominal operation position. InFIG. 2 , the extreme positions that the tensioner arms can attain are shown. In normal operation, there is a nominal position that the tensioner attains that is between these two extremes. Prior to machining, the tensioner arms are rotated into their nominal positions. Inblock 208, the bearing seats on the tensioner arms are machined to lie in the best-fit plane that was determined inblock 204. - While the best mode has been described in detail with respect to particular embodiments, those familiar with the art will recognize various alternative designs and embodiments within the scope of the following claims. While various embodiments may have been described as providing advantages or being preferred over other embodiments with respect to one or more desired characteristics, as one skilled in the art is aware, one or more characteristics may be compromised to achieve desired system attributes, which depend on the specific application and implementation. These attributes include, but are not limited to: cost, strength, durability, life cycle cost, marketability, appearance, packaging, size, serviceability, weight, recyclability, environmental factors, manufacturability, ease of assembly, etc. The embodiments described herein that are characterized as less desirable than other embodiments or prior art implementations with respect to one or more characteristics are not outside the scope of the disclosure and may be desirable for particular applications.
Claims (20)
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US15/890,572 US10514086B2 (en) | 2018-02-07 | 2018-02-07 | System and method to align belt integrated starter generator tensioners |
DE102019102863.9A DE102019102863A1 (en) | 2018-02-07 | 2019-02-05 | System and method for aligning a tensioner of a belt-integrated starter / generator |
CN201910109637.7A CN110118246A (en) | 2018-02-07 | 2019-02-11 | System and method for being directed at V belt translation starter-generator stretcher |
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US15/890,572 US10514086B2 (en) | 2018-02-07 | 2018-02-07 | System and method to align belt integrated starter generator tensioners |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10920860B2 (en) * | 2017-07-17 | 2021-02-16 | Muhr Und Bender Kg | Belt tensioning device |
US11592085B2 (en) * | 2017-10-05 | 2023-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Belt-tensioning device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2667916B1 (en) * | 1990-10-16 | 1992-12-04 | Caoutchouc Manuf Plastique | TENSIONING DEVICE OF A TENSIONER FOR FLEXIBLE LINK TRANSMISSION, OPERATING BY ELASTIC DEFORMATION OF A DEFORMABLE PARALLELEPIPEDIC SOLID. |
US6942589B2 (en) * | 2002-02-08 | 2005-09-13 | Dayco Products, Llc | Offset starter generator drive utilizing a fixed-offset dual-arm pivoted tensioner |
US20100076634A1 (en) * | 2008-09-22 | 2010-03-25 | Ford Global Technologies, Llc | Method for Controlling a Micro-Hybrid Electric Vehicle with an Automatic Transmission |
US9222769B2 (en) | 2012-12-08 | 2015-12-29 | Grale Technologies | High speed metrology with numerically controlled machines |
JP5986617B2 (en) * | 2013-12-17 | 2016-09-06 | 株式会社デンソー | Transmission system |
GB2524023B (en) * | 2014-03-11 | 2017-10-18 | Ford Global Tech Llc | Belt slip monitor |
DE102015222238B4 (en) * | 2015-11-11 | 2020-11-12 | Schaeffler Technologies AG & Co. KG | Noise-dampened self-aligning bearings for decoupling belt tensioning units |
US10029688B2 (en) * | 2016-03-17 | 2018-07-24 | Ford Global Technologies, Llc | Controlling engine auto-start while in reverse |
KR102371605B1 (en) * | 2017-06-07 | 2022-03-07 | 현대자동차주식회사 | Belt tensioner |
KR20180134564A (en) * | 2017-06-09 | 2018-12-19 | 현대자동차주식회사 | Variable belt tensioner for engine and method for controlling mild hybrid vehicle using variable belt tensioner for engine |
DE102017116000A1 (en) * | 2017-07-17 | 2019-01-17 | Muhr Und Bender Kg | Belt tensioner |
-
2018
- 2018-02-07 US US15/890,572 patent/US10514086B2/en active Active
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2019
- 2019-02-05 DE DE102019102863.9A patent/DE102019102863A1/en active Pending
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10920860B2 (en) * | 2017-07-17 | 2021-02-16 | Muhr Und Bender Kg | Belt tensioning device |
US11592085B2 (en) * | 2017-10-05 | 2023-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Belt-tensioning device |
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DE102019102863A1 (en) | 2019-08-08 |
CN110118246A (en) | 2019-08-13 |
US10514086B2 (en) | 2019-12-24 |
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